Malicious PDF — malware analysis report

Static analysis result for SHA-256 533a002de31e04e6…

MALICIOUS

PDF

76.4 KB Created: 2021-05-18 02:04:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9baf4bbcfb7064c67df579da235001d7 SHA-1: 5b70606a64c2690a0eb6b47a7d96622f30c1ca43 SHA-256: 533a002de31e04e66332a40675af87355ba258f2061eeb9b08f63e591dd0433f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://soxebez.ru/strik?utm_term=solidworks+simulation+libro+descargar PDF link annotation
    • https://barefofu.weebly.com/uploads/1/3/4/4/134492989/1840259.pdfIn PDF document text
    • https://xijukuto.weebly.com/uploads/1/3/4/3/134354051/sajepigak.pdfIn PDF document text
    • https://fugubujezowegi.weebly.com/uploads/1/3/4/5/134502495/9558424.pdfIn PDF document text
    • https://levusukep.weebly.com/uploads/1/3/0/8/130814129/xibixenotekizak_sojazobamipup.pdfIn PDF document text
    • https://vaviwajefumizin.weebly.com/uploads/1/3/5/3/135348181/2892264.pdfIn PDF document text
    • https://lujegasot.weebly.com/uploads/1/3/0/9/130969173/giramojaraxewirofe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/de0b32e4-f5f2-4fb3-aefa-b5abfc710f94/tokita.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8765f44-8ab0-4ab7-9394-6fbcb10b4a85/75231267487.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/681875c1-bfd2-49ce-a87f-626f7abcaf5b/what_is_the_importance_of_perspective_drawing.pdfIn PDF document text
    • http://lekinip.epizy.com/fundamental_accounting_principles_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66e3af8a-4c37-44a5-827e-349bb3a7457a/11929333065.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c02dc281-da44-4bde-957d-9e88eb42174d/what_is_prose_definition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a52c06e8-327e-4323-aeda-23124e0e2114/how_to_change_time_on_ritetemp_thermostat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7465666b-7c7e-4730-a460-2ccc86947001/nj_driving_test_questions_and_answers_2020_spanish.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ebc6e96-5056-4ca9-80fe-4c0ccef0e00a/xolubowagadijepenatig.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f8e7379-16aa-4ac2-a51a-526b9013bace/sigavi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/734ac8bf-6b3e-4876-9398-04679c3438e9/zetavo.pdfIn PDF document text
    • http://porumujowupof.epizy.com/91990183496.pdfIn PDF document text
    • http://fidawakuxut.epizy.com/8693087158.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F4 5656 bytes
SHA-256: 39276d3e8f86ab9682f352d32919a2804969acb329849288b971faecdf54826c
font_01_sfnt_off0000fb2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2E 12092 bytes
SHA-256: c03cb8461e1909c22fb891f425dbbb4c1a607672a0715c6077fffd793e704312

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